测地声模的径向随机定域化

摘要

In the previous paper "The ‘tadpole' localization in radial structure of geodesic acoustic mode" [Ref.1],it was shown that the radial structure of geodesic acoustic mode (GAM) near turning point appears to be a ‘tadpole' structure based on the consistency of GAM ordering with the experimentally observed small density to potential ratio without invoking the specific physical mechanism.The mechanism,so-called stochastic localization,is analyzed in the present paper in the framework of parametric destabilization to GAM,the coherent length,which remains to be answered in [Ref.1],is calculated and some aspects related with experiments are discussed.%在文献[1]中,通过分析实验上观察到的测地声模的小密度-电位比与测地声模谐波定级的自洽性,论证了测地声模是在转向点附近一种“蝌蚪状”的定域结构,但没有给出导致这种结构的物理机制.从随机媒质对波传播产生定域化的角度进行了探讨,采用测地声模由漂移波湍流参量激发的产生模型,计算了随机定域化导致的也是文献[1]所关注的相干长度.讨论了与实验观测比较的有关问题.